Why can't Parliament bind its successor?

Parliament cannot bind its successor due to the principle of parliamentary sovereignty, which holds that each Parliament is free to make or unmake any law it chooses. This means that no Parliament can impose restrictions on future Parliaments, as they have the authority to repeal or amend existing laws. Additionally, allowing one Parliament to bind its successors would undermine the democratic process and the ability of future representatives to respond to changing needs and circumstances. Thus, each Parliament operates independently and is not legally bound by the decisions of its predecessors.